Punching-machine.



PATENTED AUG. 8, 1905.

W. G. YEATMAN & C. F. MESSINGER.

PUNGHING MACHINE.

APPLICATION FILED NOV.25, 1901.

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PUNU-HING MACHINE. APPLICATION FILED NOV. 25, 1901.

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UNITED STATES PATENT ()FFICE.

WALTER C. YEATMAN AND CHARLES FREDERIC MESSINGER, OF CHICAGO, ILLINOIS.

PUNCHING-MAGHINE.

Specification of Letters Patent.

Patented Aug. 8, 1905.

A li ti fil d November 25, 1901. Serial No. 83,591.

To all whom, it may concern:

Be it known that we, WALTER C. YEATMAN and CHARLEs FREDERIG MESSINGER,citizens of the United States, residing at Chicago, in the county ofCook and State of Illinois, have invented certain new and usefulImprovement in Punching-Machines, of which the following is a full,clear, concise, and exact description, reference being had to theaccompanying drawings,forming a part of this specification.

Our invention relates to punching-machines, and in particular tomachines for punching hexagonal and similar articles, such as nuts.

The principal objects of the invention are to provide a simple,practical, durable, and eiiicient punching machine and to arrangeparticularly for the punching of articles in accordance with ourimproved punching process. This process we have set forth and claimed inan application executed by us of even date herewith, Serial No. 83,590.

In the accompanying drawings, Figure 1 is a side elevation of a portionof a punchingmachine embodying our invention. Fig. 2 is a front view ofthe same. Figs. 3 and 4 are face views of the cooperating punchingmembers. Figs. 5 and 6 are vertical sections taken Fig. 7 is a verticalsection taken on line 7 7 in Fig. 1.

The machine which we have shown in the accompanying drawings toillustrate our invention is particularly adapted for the punch ing ofhexagonal nuts in accordance with our improved method of preparing thesame. In this new method we employ a strip or blank of sheet metalhaving a thickness equal to the thickness of the article to be preparedand a width equal to the shortest width thereof or, as in the case ofhexagonal, octagonal, and similar articles, the distance betweenopposite parallel sides. From this strip or blank the articles arepunched in such a manner that one side of the article or two oppositeparallel sides thereof are formed by side edge portions of the strip orblank. In the case of hexagonal and octagonal nuts two opposite parallelsides are formed by two opposite portions of the side edges of theblank.

The machine which we have shown herein for carrying out this improvedprocess is shown provided with a base or bed A and an elevatedcooperating head B, between which two structures there is a relativereciprocal movement secured in any desirable wayas, for example, byreciprocating the head B toward and away from the base A. As suchreciprocating mechanisms are common in punching processes and as thesame forms no part of our present invention, none has been shown herein.

The base A is provided with a die-block C, which is suitably held uponthe base, as by a set-screw a. This die-block is provided with ahexagonal aperture 1, into which the hexagonal nuts are to be punched.This aperture flares downwardly, as shown in Fig. 2, whereby thepunchings can readily drop. This aperture 1 is arranged so that twosides extend in a direction from front to rear. The block C is alsoprovided with a pair of holes or apertures 2 2, desirably arranged oneon It is each side of the hexagonal aperture 1. also provided with agage-pin 3 immediately in advance of the hexagonal aperture 1, whichgage-pin is desirably made with a pointed front end, which is locatedsubstantially at the rearward pointed end of the hexagonal aperture 1,as well shown in Fig. 4:.

A stripper-plate 4 is mounted upon the dieblock C and secured thereto,as by screws 5 5. This plate 4 does not cover the entire top surface ofthe die-block C, but terminates in the front of the hexagonalaperture 1. It has its lower surface provided with a groove 6, so thatwhen it is secured upon the die-block a closed channel or guideway forthe metal strip or blank is formed. This channel or guideway is arrangedin alinement with the gage-pin 3 and hexagonal aperture 1, with thesides of the channel directly in alinement with opposite parallel sidesof the aperture 1. The stripperplate 4 is also provided with an aperture6, formed by a collar 7, set therein, and this aperture opens into thechannel 6 and continues through the die-block C.

The reciprocating head B is provided with a punch-block D, which issecured firmly to the head, as by providing the head with a cylindricalend 8, adapted to fit in an aperture in the head B, and by a set-screwb, fitted intothe head B.

The punch-block D is constructed with a depending rear portion cl ofsubstantially the width of the stripper-plate 4:.

block D is provided with a hexagonal punch 9, adapted to enter thehexagonal aperture 1 in the die-block C. The punch 9 is provided Thispunchwith a small pointed projection 10, adapted to enter the opening orhole in the hexagonal nut. The punch-block D is also provided with apair of stout pins or pilots 11 11, adapted to enter the apertures 2 2in the dieblock (1. The hexagonal punch 9 and pilots 11 11 are securedin position in the die-block in any wayas, for example, by set-screws 1212. The punch-block D is also provided with a small punch 13, suitablefor punching the holes in the nuts and adapted to enter the aperture 6in the stripper-plate 4. The machine thus constructed operates asfollows:

When the blank X is fed through the channel 6 and the head B is suitablyreciprocated, each reciprocation of the head causes the punch 9 to enterthe hexagonal aperture 1, and thus punch a hexagonal nut from the end ofthe strip or blank. By each reciprocation also the punch 13 passes intothe aperture 6' and punches a hole which forms the aperture for the nutnext punched. Before the punch 9 strikes the blank, however, the pilots11 11 enter the aperture 2 2, in which they slide and work slightlybefore, during, and shortly after the punching operation. After eachpunching operation the strip or blank X is fed properly forward, so thatits forward end strikes the gage-pin or stop 3 whose pointed end fitsinto the corner of the angle cut in the front end of the blank. Thus ateach reciprocation of the head B there is cut from the blank X a nuthaving two of its sides formed by portions of the side edges of thestrip, and at the same time a hole is punched for the next nut. Thepunched and apertured nuts drop through the hexagonal aperture 1 and theremaining scraps, consisting of V-shaped structures, pass on oppositesides of the gage-pin or stop 3 and off from the die-block C.

It will be noted that this machine has,among others, the followingpoints of advantage:

By the employment of the two pilots 11 11 the punch-block D is broughtinto firm and rigid engagement with the die-block C before the punch 9strikes the material. Thus all lateral strain of the press and all lostmotion of the reciprocating head is taken up, and, furthermore, theparts are held relatively against transverse movement, so that thepunching operation is perfectly accurate and reliable and there is nointerference of parts due to lack of alinement. By dispensing with thestripper-plate the punch can be made very short. The advantage gained inthis respect is well illustrated by comparison of the punch 13 and itsstripper-plate 4 with the punch 9. The punch 13 is relatively long, madeso by having to pass through the stripper-plate 4 before encounteringthe material and performing the punching operation; but the punch 9 bythe absence of thestripper-plate is made relatively short.

As another advantage the gage-pin 3 engages the front end of the stripor blank, and thus insures the punching of the next nut in the propermanner. By making the front end of this gage-pin pointed engagement issecured between this point and the corner of the angle cut inthe blank,thus insuring stoppage of the blank at precisely the proper point andalso engaging it in such a manner as to prevent any lateral movement ordisplacement of the end undergoing the punching operation. of the pin 3relatively to the pilots 11 11 the scraps are permitted to move betweenthe pin and the pilot,thus having free exit from the punch andinsuring-the proper falling of the waste stock without interference withthe operation of the press.

It will be understood that we do notiiitfid to limit ourselves to theexact construction and arrangement herein set forth, as various devicesand portions of the machine can be changed or modified at will withoutdeparting from the spirit of our invention. For example, the pilots 1111 can be varied in number and can be arranged differently in relationto the dies and other parts, if desired. Other modifications and changeswill suggest themselves to those well versed in this art.

What we claim as our invention is 1. The combination of a reciprocatinghead having two punches, one for punching the nutblank from thestrip,and the other for punching a hole in the end portion of the stripwhich becomes the nut, a die-block having dies for said punches, and astripper-plate mounted on the dieblock and provided with a channelforming a closed guideway leading to the nutpunch, said plate beingprovided with an aperture for the hole-punch, substantially asdescribed.

2. The combination of a reciprocating head having two punches, one forthe nut-blank,and the other for the hole therein, the former punch beingprovided with a centering-pin, a die-block having dies for said punches,and a stripper-plate mounted on said head and provided with a channelforming a closed guideway leading to the nut-punch, said plate beingprovided with an aperture for the hole- 7 punch, substantially asdescribed.

3. The combination of a reciprocating head having two punches, one forpunching the nutblank, and the other for punching a hole in the endportion of the strip the nut-blank punch being hexagonal or of similarform, a die-block having dies for said punches, and a stripper-platehaving a channel whose width is substantially the distance betweenparallel sides of the hexagonal or like die, said channel being arrangedwith its sides in alinement with parallel sides of the die, and saidplate being provided with an aperture for the holepunch, substantiallyas described.

4:. The combination of a reciprocating head having a projecting portion,a punch for the Furthermore, by the arrangement nut-blanks fitted intoand extending outwardly from said projecting portion, a. punch forforming apertures in an end portion of the strip, said hole-punch beingfitted into and extended from the receding portion of the head, adie-block having dies for said punches, and a stripper-plate mounted onsaid dieblock and arranged between the same and the receding portion ofthe head, and being provided with an aperture for said hole-punch,substantially as described.

5. The combination of a pair of cooperating members, one of which isarranged to reciprocate toward and away from the other, of a pair ofpunches carried by one of said memb'ers, one punch being for strikingnut-blanks from a strip of metal, and the other punch being for punchingholes in an end portion of said strip which is struck off by the otherpunch, dies for said punches carried by the other member, and astripper-plate carried by the die member and provided with a channelforming a guideway to the nut-blank punch and also provided with anaperture for the hole-punch, substantially as described.

6. The combination of a pair of cooperating members, one of which isarranged to reciprocate toward and away from the other, a pair ofpunches carried by one of said members, one of said punches being forstriking nut-blanks from a strip of metal, and the other for punchingholes in an end portion of said strip. a guideway for the metal stripleading to the nut-blank punch, and means for holding the strip againstmovement on the upstroke of the hole-punch, substantially as described.

7. A machine for making apertured nutblanks of hexagonal or similar formcomprising a pair of cooperating members, one of which is arranged toreciprocate toward and away from the other, a pair of punches carried byone of said members, one of said from, substantially as described.

8. The combination of a die-block C having a hexagonal aperture 1 andalso having apertures 2, 2, on opposite sides of the aperture 1, apointed stop 3 secured to the die-block 'C at the forward end of thedie-aperture 1, a

stripper-plate 41: secured to the front of the die-block and terminatedat the rear edge of the aperture 1, said stripper-plate being providedwith a groove of substantially the same width as the width of the dieand being arranged with the sides of said groove in alinement withopposite sides of the hexagonal aperture 1, said stripper-plate beingalso provided with an aperture 6 formed by a collar 7, a reciprocatinghead D arranged above the die-block G and constructed with a dependingportion cZ arranged to descend behind the stripper-plate, and providedwith a punch 9 having a pin 10, pilot-pins 11, 11, secured to thereciprocating head D and adapted to work in the apertures 2, 2, and apunch 13 also secured to the head D and arranged to work in the aperture6, substantially as described. In witness whereof we hereunto subscribeour names this 18th day of November, A. D.

WALTER O. YEATMAN. C. FREDERIC MESSINGER.

Witnesses:

A. MILLER BELFIELD, HARVEY L. HANSON.

